<template>
  <view class="">
    <my-search @clickSearch='clickSearch'></my-search>
    <view class="scroll-view-container">
      <scroll-view scroll-y class="scroll-view-left" :style="{height: wh + 'px'}">
        <block v-for="(item, index) in cateList" :key="index">
          <view :class="['left-scroll-view-item', index === activeIndex?'active':'']" @click="changeActiveIndex(index)">{{item.cat_name}}</view>
        </block>
      </scroll-view>
      <scroll-view scroll-y class="scroll-view-right" :style="{height: wh + 'px'}" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item, index) in cateLevel2List" :key="index">
          <view class="cate-lv2-title">/ {{item.cat_name}} /</view>
          <view class="cate-lv3-list">
            <view class="cate-lv3-item" v-for="(child,i) in item.children" :key="i" @click="handleToGoodList(child)">
              <image :src="child.cat_icon"></image>
              <text>{{child.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        wh: 0, //设备可用高度
        cateList:[],
        activeIndex: 0,
        cateLevel2List:[],
        scrollTop: 0
      };
    },
    onLoad(){
      const sysInfo = uni.getSystemInfoSync()
      this.wh = sysInfo.windowHeight - 50
      this.getCateList()
    },
    methods:{
      async getCateList(){
        const res = await uni.$http.get('/api/public/v1/categories')
        if (res.data.meta.status !== 200) return uni.$showMsg()
        // 转存数据
        this.activeIndex = 0
        this.cateList = res.data.message
        this.cateLevel2List = this.cateList[0].children
      },
      changeActiveIndex(i){
        this.activeIndex = i
        this.cateLevel2List = this.cateList[i].children
        this.scrollTop = this.scrollTop === 0 ? 1 : 0
      },
      handleToGoodList(item){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?cid=' + item.cat_id
        })
      },
      clickSearch(){
        uni.navigateTo({
          url:"/subpkg/search/search"
        })
      }
    }
  }
</script>

<style lang="scss">
.scroll-view-container{
  display: flex;
  .scroll-view-right{
    background-color: #fff;
  }
  .scroll-view-left{
    width: 120px;
    .left-scroll-view-item{
      background-color: #f7f7f7;
      line-height: 60px;
      text-align: center;
      font-size: 12px;
      &.active{
        background-color: #FFFFFF;
        position: relative;
        &::before{
          content: '';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #C00000;
          position: absolute;
          top: 50%;
          left: 0;
          transform: translateY(-50%);
        }
      }
    }
  }
  .cate-lv2-title {
    font-size: 12px;
    text-align: center;
    font-weight: bold;
    padding: 15px 0;
  }
  .cate-lv3-list{
    display: flex;
    flex-wrap: wrap;
    .cate-lv3-item{
      width: 33.33%;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      margin-bottom: 10px;
      image{
        width: 60px;
        height: 60px;
      }
      text{
        font-size: 12px;
      }
    }
  }
}
</style>
